15Kwatt "Quad Finned Triptych" Foamy Jet. - RC Groups
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Mar 19, 2012, 06:02 PM
jofro
Discussion

15Kwatt "Quad Finned Triptych" Foamy Jet.


Just started on my largest up to date project, pushing the limit and my luck. 15+ Kw foamy jet at 10' 6" x 7' span. The central 127mm EDF unit will be supported by 90mm boosters on each side running on 28S/105Volts/400+Amp current draw combined with 15-17kg thrust. Using only 6mm foam sheets and lot of C/F is going to make this build bit of a challenge I'm really looking forward to. This is not a build log, only few upgrades will be aded about my progress untill my full buid and flying reviews in RC magazines, Joe.
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Mar 20, 2012, 01:16 AM
Registered User
Quote:
Originally Posted by jofro
Just started on my largest up to date project, pushing the limit and my luck. 15+ Kw foamy jet at 10' 6" x 7' span. The central 127mm EDF unit will be supported by 90mm boosters on each side running on 28S/105Volts/400+Amp current draw combined with 15-17kg thrust. Using only 6mm foam sheets and lot of C/F is going to make this build bit of a challenge I'm really looking forward to. This is not a build log, only few upgrades will be aded about my progress untill my full buid and flying reviews in RC magazines, Joe.
Joe, that's insane!! I am really looking foreword to seeing how this ends up. You really know how to push the envelope! 100+ volts? Wicked!
Mar 20, 2012, 01:41 AM
jofro
My wife thinks the same of me, but if I don't do something new, different I feel that I'm going backwards in this hobby. I.m really pushing the size limit with this one because of my work bench. 105 volts! I said, combined, 2x8-10S and 1x12S. 5-6kg in batteries but despite the weight this model will be a floater, Joe.
Mar 20, 2012, 02:21 AM
Micro Boat Forum Founder
boredom.is.me's Avatar
My question is why only 6mm sheets? You can get 1", 2", and sometimes 4" thick 4'x8' sheets at Home Depot. You can use that as your base, then skin it with the 6mm for a smooth surface.
Mar 20, 2012, 06:34 PM
jofro
Quote:
Originally Posted by boredom.is.me
My question is why only 6mm sheets? You can get 1", 2", and sometimes 4" thick 4'x8' sheets at Home Depot. You can use that as your base, then skin it with the 6mm for a smooth surface.
Hi, answer to your question, because it is the easiest and cleanest to work with. 6x6 C/F makes it perfect for laminating to get my strength. Joe.
Mar 22, 2012, 02:42 AM
jofro
Working on formers to hold the power unit in place, each fan will have 50cm long thrust tube to get the optimal nperformance, Joe.
Mar 31, 2012, 04:54 AM
jofro
Little progress with my foamy working out placement for 8 sets of batteries, Joe.
Apr 02, 2012, 05:21 PM
jofro
The main frame almost complete, Joe.
Apr 03, 2012, 05:16 PM
jofro
The first sign of life, primer and two more coats to go, Joe.
Apr 08, 2012, 04:05 AM
jofro
6 more inches aded to length after installation of my quad Rudd. fins will make this model pretty good size, Joe.
Apr 08, 2012, 07:35 AM
When pigs fly rc
rcrich's Avatar
Wow!!!!
Apr 08, 2012, 12:44 PM
Registered FFF Addict
larryross's Avatar
Wow is a good comment.
Great size Jofro. Looks good hope it flies as good as it looks. Have a safe maiden.

What is the weight with 8 sets of batteries?

Regards
Larry
Apr 08, 2012, 07:19 PM
jofro
Quote:
Originally Posted by larryross
Wow is a good comment.
Great size Jofro. Looks good hope it flies as good as it looks. Have a safe maiden.

What is the weight with 8 sets of batteries?

Regards
Larry
Hi, again lot heavier then originally expected! For my maiden I'll will use lighter (40cell combined) 30C/4Ah packs resulting in15kg AUW but despite, its very light w/loaded model due to its huge wing area. 2.5kg in bonding agents alone and there's no way to minimize that, 1/2kg in 8G leads and connectors not mentioning the rest so it all ads up. I believe equivalent size composite build would be twice the weight so I'm still laughing, Joe.
Apr 08, 2012, 07:53 PM
Retired CAD guy
birdofplay's Avatar
at 15kw you should be able to fly ROCKS !

go for it !


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